score:1

you didn't say how you want to merge them, so i'll assume you want the union of both sets (i.e. combining them and eliminating duplicates):

var finalticket = ticketstatus.union(ticketsev);

if you want to keep duplicates or know there won't be any, you can concatenate the sequences instead:

var finalticket = ticketstatus.concat(ticketsev);

score:2

var finalticket = ticketstatus.union(ticketsev);   // remove duplicates
var finalticket = ticketstatus.concat(ticketsev);  // keep duplicates

score:3

simple use this to concatenate and remove duplicate

var finalticket = ticketstatus.union(ticketsev);   

to simple concatenation and sort. duplicates are preserved. use .concat() on place of .union()

to implement this in best way follow the following links:
how to: combine and compare string collections (linq)
merging two collection<t>
create a list from two object lists with linq


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